Pump assembly for liquid fuel burners



March 13, 1951 J. A. WILSON PUMP ASSEMBLY FOR LIQUID FUEL BURNERS Filed Aug. 20, 1947 g fohn/ (f l 2 2 20% Patented Mar. 13, 1951 UNITED STATES PATENT OFFICE PUMP ASSEMBLY FORLIQUID'FUEL BURNERS John A; Wilson, Columbus,;hio,iassignorto.The Lennox Furnace Cm, Marshalltowng'lowa a corporation of Iowa Application August 20, 1947 ,Serial No: 769,635

' heat is required, and to furthermore prevent surging of the oil delivered, to inhibit pulsations in the flame and to provide for even dis tribution of airand oil.

It is another object of theinvention to provide a pump assembly .for vertical rotary liquid fuel burners which is compact and inexpensive to manufacture.

An additional objectofthednvention is to provide improved bearings for a-pump assembly for a vertical rotary liquidfuel burner to reduce wear and wobble and to insure quiet operation.

It is a further object of the invention to provide a pump assemblyfor a verticalrrota-ry liquid fuel burner which may have theamount of liquid fuel delivered by the pump readily adjustable and easily controlled by an adjustment at the outlet side of the pumping element.

It is still another object o-fthe invention to provide a pump' for vertical rotary .liquid fuel burners in which the pumping element forces liquid downwardly into. a small chamber and then upwardl to oil distributing fiinger tubes.

It is also an object of the invention to provide a pump assembly for vertical rotary liquid fuel burners iii which the parts are easytornachine and assemble, particularly the main drive shaft which forms a part of thepumping element, and

also conveys liquid under pressure to the iflinger tubes.

With these and otherobjects in view, :the:.invention consists in the construction, arrangement and combination of the .various parts of my device whereby the objectscontemplated are attained, as. hereinafter more fully .set forth, pointed outin the claims and illustrated. in the accompanying drawings, wherein:

Figure 1 is a sectional view of the improved pump assembly with parts of the supporting structure and hearth shown for the, sake of .completeness;

Figure 2 is a detailed View, partially in section and partially in elevation showing the pumping element of the assembly;

Figure 3 is a sectional view taken eniline 3+3, of Figure 1; and

'Figure 4-:is azpartial detail viewzofrztheqair i shutter.

Referring tspecificallyito the drawing g-for;v a

ldetailed description of. :the. invention; "numeral ll designates generally a maincasting for 5 the body of the pump, which. casting; is .cupgshaped and forms a ."housing 12 for a motor egenerally indicated'ats.l3. The motoris. of the, induction type and-includes a: rotor: l5 and a ;stator 14.

'At the bottomoflthe cup shapedcasting: I 11,; an upwardly extending-boss i 8 is provided. 2 Also,

= a downwardlyextendingboss l1 is'form'eda on the casting "I i. i The composite lbossformedgby the parts: It. and i1 iSQhOH-OWfaIld therbottomthereof is closed by a screw threadediplug lt. I Ax horizontally extending azprojection 719*is -formed on.v the lower bossslloforgthereception of avalve generally indicated'tatq2 l, which ,valve l is used for a purpose hereinafter. described.

The main casting pH is provided with a,.plu-

rality-of ears or lugs 521: b which the entire assembly is supported from horizontalhsupport- 'ing lugs- 23 through the: medium of studs-r24 and 1 nuts25. The lugsi23tare. secured to a plate-20 preferably by .welding. t The casting I i :extends 'upwardly, as shown =:at= 2"s ;:and it engages with I a supporting collar 39 a hearth plate '21, only a portion-Lot which; is shown; which may be formedofmetal. or.refractory'material, andiextends outwardly. from the supporting. collar 3;].

The casting :it near the bottom centraLporutionthereof is providedwith an inlet conduit 28 and has an inlettpassage 2ggbored therein in communication with the inlet conduit 28.. The

'- boss I 6 is shouldered-as shown at -3I,- and a v tubular sleeve'fii abustheshoulder fil and extends-upwardly a'considerable distance fromv the boss is forming an: o-penichamber "32a.

1 A bearing member generally indicated by the numeral 33, is pressed into the bosses ileandll and; is thus rigidly. secured thereto. The bearing:member.33 is provided with at-vertically extendingwmachined passage 35.- The bearing member 63 issalso provided with a horizontally bored passageLSEiadjacent the upper end thereof and with a smallupassage 37 for conveying liquid to theupperbearing surface-49 to lubricate the same. The bearing member 33 is so formed that when assembledinto boss 16, it providesan inlet passage 34 which communicates with-the space surrounded by the tubular sleeve 32.= The bearing 33 is furthermoreprovidedwith a bored outlet passage 33 adjacent the bottomx. thereof which communicates with abored outlet conduit 39 in the projection l9 and a threaded valve 42 including a slotted valve stemJH: which extends therethrough. A threaded stationary valve member d3 receives the valve 62. A packing M, retained in place by a packing nut 45, prevents the leakage of oil or fuel from the valve. The valve A2 is provided with a handle 56 so that the valve stem ll may be screwed in and out to provide a larger or small orifice for the passage of oil from the conduit 5st. The screw plug it forms a small oil chamber Q? in the boss ll below the bottom of the bearing member 33.

The main drive shaft and pumping element is generally shown at 58 and is provided with upper bearing surfaces 49 and lower bearing surfaces at, which are supported by the bearing 33. This construction provides bearing surfaces at two points, thus providing a rigid structure which is not subject to excessive wear. It will be noted particularly from Figure 2 that the shaft 48 is provided with a spiral or screw threaded pumping element 52 and that there is no contact between the thread 52 and the bearing between the bearing surfaces 69 and 5f. The shaft is also provided with a ball 52-3 at the bottom thereof, which is in engagement with the plug l8 and provides a vertical thrust bearing for the shaft 43.

The shaft 38 is provided with bored inlet openings 5d at the bottom thereof, which communicate with a bored central passage 55 extending completely through the shaft 68. At the top of the shaft 38, outlet passages 56 and relief spaces Mia are provided. A metal head 5i is secured to the shaft it by a pressed fit and is, therefore, rigidly secured thereto. The head 5i is provided with bolts 58 which support the rotor E5 of the electric motor l3. Outlet passages 59 are bored in the head 5? and have oil distributing or flinger tubes 6i secured thereto. A fan plate 62, having fan blades c3 fastened thereto, is secured to the head W by a cap screw E l. Passage 55 is closed at its upper end by headless set screw fill.

The bulk of air for combustion enters through opening 8?! and is controlled as to volume by vertical rotative movement of an air shutter 68. Three lugs 89 are attached to shutter 68. The lugs 69 have slanting slots M which ride on pins 72, projecting inwardly through casting ll. Rotative movement by an air adjusting means or handle (not shown) causes shutter 63 to rotate and rise in front of the fan blades 63 and reduces the volume of air delivered therefrom. Opening 85 provides ventilation for the motor parts and permits any oil leakage to drain from casting l l. During operation a small quantity of air enters through opening 55, passes up around the motor parts and is also projected outwardly by the fan.

Liquid, usually oil, is supplied to the pump assembly from a reservoir (not shown), positioned above the level of the pump assembly. The liquid enters the in-et conduit 28, passes through the bore 29, into the chamber 33, passage and into chamber 32a. The liquid level is maintained in chamber 32a above the inlet opening 36 by gravity flow. The liquid is drawn into the bore 33, when the pump starts operating and is then pumped downwardly along the outside of the shaft 53 by the spiral pump 52. Oil under pressure then is forced out through the outlet passage 38, outlet conduit 38, past valve stem ll and into reservoir ll from whence it is forced into the passages 54 in the shaft 48 and upwardly through the vertical passage 55, through the outlet passages 55, spaces Sea and outlet passages 59, into the flinger tubes 6 l. The bulk of the air for combustion is drawn inwardly through opening ti and then forced outward through the space between air shutter 68 and the fan top 52, to thereby support combustion. The space between air shutter 68 and the fan top 62 will be varied by adjustment of the air shutter depending on the volume of air required.

It will be apparent that the amount of oil delivered by the pump may be accurately metered by the valve 2i, which is at the outlet or pressure side of the pump, without effecting the operation of the pump in any way and without starving the pump. The pump is self-priming and will deliver small quantities of oil or will deliver large quantities of oil, depending upon the adjustment of valve stem 4|.

From the foregoing it will be apparent that I have provided an extremely compact pump assembly for wall flame type oil burners, which has a wide capacity for pumping oil and in which the oil may be metered accurately.

Some changes may be made in the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope without sacrificing any of the advantages thereof.

I claim as my invention:

1. A liquid fuel pumping and projecting device comprising a vertical shaft, means for conveying fuel to an intermediate portion of the exterior of said shaft, bearing means for said shaft, a screw threaded portion on the exterior of said shaft arranged to pump fuel supplied thereto downwardly, an axial passage formed in said shaft adapted to convey fuel upwardly, means affording communication between the bottom of the screw and the bottom of said axial passage, means for metering the fuel disposed between the bottom of the screw and said axial passage, fuel distributing tubes in communication with said axial passage adjacent the top thereof and motor means for rotating said shaft and fuel distributing tubes.

2. A liquid fuel pumping and projecting device comprising a Vertical shaft, means for conveying fuel to an intermediate portion of the exterior of said shaft, bearing means for said shaft, a screw threaded portion on the exterior of said shaft arranged to pump fuel supplied thereto downwardly, an axial passage formed in said shaft adapted to convey fuel upwardly, means affording communication between the bottom of the screw and the bottom of said axial passage, means for metering fuel disposed between the bottom of the screw and said axial passage, said metering means comprising a manually adjustable valve, fuel distributing tubes in communication with said axial passage adjacent the top thereof and motor means for rotating said shaft and fuel distributing tubes.

3. A liquid fuel pumping and projecting device comprising a vertical shaft, upper and lower bearing means for said shaft, a screw threaded portion on said shaft between the bearing means arranged to pump fuel downwardly along the exterior of said shaft, means for conveying fuel to said screw threaded portion adjacent the upper part thereof, a vertical passage formed throughout substantially the entire length of said shaft and adapted to convey fuel upwardly therethrough, means affording communication be tween the shaft adjacent the bottom of said screw and the bottom of said vertical passage, fuel distributing tubes in communication with said vertical passage adjacent the top thereof, and motor means for rotating said shaft and fuel distributing tubes.

4. A liquid fuel pumping and projecting device comprising a vertical shaft, upper and lower bearing means for said shaft, a screw threaded portion on said shaft between the bearing means arranged to pump fuel downwardly along the exterior of said shaft, means for conveying fuel to said screw threaded portion adjacent the upper portion thereof, a vertical passage formed throughout substantially the entire length of said shaft and adapted to convey fuel upwardly therethrough, means affording communication between the shaft adjacent the bottom of said screw and the bottom of said vertical passage, means for metering the fuel disposed between the bottom of the screw and said vertical passage, fuel distributing tubes in communication with said vertical passage adjacent the top thereof, and motor means for rotating said shaft and fuel distributing tubes.

5. A liquid fuel pumping and projecting device comprising a vertical shaft, a bearing member for said shaft providing upper and lower main bearings therefor, a screw threaded exterior portion on the shaft between said bearing surfaces and arranged to pump the fuel downwardly, means provided on the exterior of the bearing member for conveying fuel to said shaft adjacent the top of the screw threads, an axial passage formed in said shaft adapted to convey fuel upwardly, means for conveying fuel from the bottom of the screw threads to said axial passage, fuel distributing tubes in communication with said axial passage adjacent the top thereof and rotatable by said shaft, and motor means for rotating the shaft to effect pumping of the fuel.

6. A liquid fuel pumping and projecting device comprising a main cup shaped housing member, an upwardly extending boss disposed centrally of the bottom of the housing member, a vertical shaft, a bearing member for said shaft supported by said boss and extending upwardly therefrom, a screw thread formed on the exterior of said shaft and arranged to pump fuel downwardly, means for conveying fuel through said housing and to the top of the screw threads, said shaft having a vertical passage extending substantially completely therethrough and closed at the top, means for conveying fuel pumped by said screw threads from adjacent the bottom thereof to said vertical passage, said last means being partly formed in said housing, fuel distributing tubes in communication with said vertical passage adjacent the top thereof for receiving fuel forced upwardly through said vertical passage. and a motor for rotating said shaft and distributing tubes.

7. A liquid fuel pumping and projecting device comprising a vertical shaft, a bearing member for said shaft providing upper and lower main bearings therefor, a screw threaded exterior portion on the shaft between said bearing surfaces and arranged to pump the fuel downwardly, means provided on the exterior of the bearing member for conveying fuel to said shaft adjacent the top of the screw threads, an axial passage formed in said shaft adapted to convey fuel upwardly, means for conveying fuel from the bottom of the screw threads to said axial passage. a relief passage between said axial passage and the upper bearing for lubricating the latter, and motor means for rotating the shaft to effect pumping of the fuel.

'8. A liquid fuel pumping and projecting device comprising a main cup shaped housing member, an upwardly extending boss disposed centrally of the bottom of the housing member, a vertical shaft, a bearing member for said shaft supported by said boss and extending upwardly therefrom, a screw thread formed on the exterior of said shaft and arranged to pump fuel downwardly, means for conveying fuel through said housing and to the top of the screw threads, a downwardly extending boss disposed centrally of the housing member, a portion of said fuel conveying means being formed by said downwardly extending boss, said shaft having a vertical passage extending substantially completely therethrough and closed at the top, means for conveying fuel pumped by said screw threads from adjacent the bottom thereof to said vertical passage, said last means being partly formed in said downwardly extending boss, fuel distributing tubes in communication with said vertical passage adjacent the top thereof for receiving fuel forced upwardly through said vertical passage, and a motor for rotating said shaft and distributing tubes.

9. A liquid fuel pumping and projecting device comprising a main cup shaped housing member, an upwardly extending boss disposed centrally of the bottom of the housing member, a vertical shaft, a bearing member for said shaft supported by said boss and extending upwardly therefrom, a screw thread formed on the exterior of said shaft and arranged to pump fuel downwardly, means for conveying fuel through said housing and to the top of the screw threads, a downwardly extending boss disposed centrally of the housing member, a portion of said fuel conveying means being formed by said downwardly extending boss, said shaft having a vertical passage extending substantially completely therethrough and closed at the top, means for conveying fuel pumped by said screw threads from adjacent the bottom thereof to said vertical passage, said last means being partly formed in said downwardly extending boss, fuel distributing tubes in communication with said vertical passage adjacent the top thereof for receiving fuel forced upwardly through said vertical passage, said screw threads and bearing being partially encompassed by both of said bosses, and a motor for rotating said shaft and distributing tubes.

JOHN A. WILSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

